Tìm x
a, 2x-49=5×3 mũ 2
b,128-3×(x+4)=23
c,2(x-51)=2×2 mũ 3 +20
d,135-5(x+4)=35
e,450÷(x-19)=50
g,25+3(x-8)=106
h,x-[42+(-28)]=-8
Tìm x a, 2x-49=5×3 mũ 2 b,128-3×(x+4)=23 c,2(x-51)=2×2 mũ 3 +20 d,135-5(x+4)=35 e,450÷(x-19)=50 g,25+3(x-8)=106 h,x-[42+(-28)]=-8
By Adalynn
a, 2x-49=5×3 mũ 2
=> 2x-49 = 45
=> 2x = 45 + 49
=> 2x = 94
=> x = 47
b, 128-3×(x+4)=23
=> 3×(x+4) = 128 – 23
=> 3×(x+4) = 15
=> x + 4 = 5
=> x = 1
c,2(x-51)=2×2 mũ 3 +20
=>2(x-51)= 36
=> x-51 = 18
=> x = 69
d,135-5(x+4)=35
=> 5(x+4) = 100
=> x+4 = 20
=> x = 16
e,450÷(x-19)=50
=> x-19 = 9
=> x = 28
g,25+3(x-8)=106
=> 3(x-8)= 81
=> x-8 = 27
=> x = 35
h,x-[42+(-28)]=-8
=>x- 14 = -8
=>x = 6
Lớp 6 nên mk lm tắt nha
a, 2x – 49 = 5 x 3^2
2x – 49 = 5 x 9
2x – 49 = 45
2x = 45 + 49
2x = 94
x = 94 : 2
x = 47
b, 128 – 3 x (x+4) = 23
128 – 3x – 12 = 23
128 – 12 – 3x = 23
116 – 3x = 23
3x = 116 – 23
3x = 93
x = 93 : 3
x = 31
c, 2(x – 51) =2 x 2^3 + 20
2x – 102 = 2 x 8 + 20
2x – 102 = 16 + 20
2x – 102 = 36
2x = 36 + 102
2x = 138
x = 138 : 2
x = 69
d, 135-5(x+4)=35
135 – 5x – 20 = 35
135 – 20 – 5x = 35
115 – 5x = 35
5x = 115 – 35
5x = 80
x = 80:5
x = 16
e, 450÷(x-19)=50
x – 19 = 450 : 50
x – 19 = 9
x = 9 + 19
x = 28
g,25+3(x-8)=106
3x – 24 = 106 – 25
3x – 24 = 81
3x = 81 + 24
3x = 105
x = 105 : 3
x = 35
h,x-[42+(-28)]=-8
x – 14 = -8
x = -8 + 14
x = 6
Cho mình câu trả lời hay nhất nha ❤️????